# We enable gzip as a compression mechanism.
  location ~ ^/(assets|images|javascripts|stylesheets)/   {
      try_files $uri @rails;
      access_log off;
      gzip_static on;

      # to serve pre-gzipped version
      expires max;
      add_header Cache-Control public;

      add_header Last-Modified "";
      add_header ETag "";
      break;
   }